{"id":160,"date":"2023-02-21T15:06:40","date_gmt":"2023-05-02T16:20:48","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%ae%e3%82%b7%e3%83%b3%e3%82%b0%e3%83%ab%e3%83%88%e3%83%b3%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3%e3%81%ae%e3%83%99%e3%82%b9%e3%83%88%e3%83%97%e3%83%a9\/"},"modified":"2025-07-31T21:16:14","modified_gmt":"2025-07-31T12:16:14","slug":"java%e3%81%ae%e3%82%b7%e3%83%b3%e3%82%b0%e3%83%ab%e3%83%88%e3%83%b3%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3%e3%81%ae%e3%83%99%e3%82%b9%e3%83%88%e3%83%97%e3%83%a9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%82%b7%e3%83%b3%e3%82%b0%e3%83%ab%e3%83%88%e3%83%b3%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3%e3%81%ae%e3%83%99%e3%82%b9%e3%83%88%e3%83%97%e3%83%a9\/","title":{"rendered":"Java\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u4f8b"},"content":{"rendered":"<h3>\u4ee5\u4e0b\u306f\u3001\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306a\u8a00\u3044\u65b9\u3067\u8868\u73fe\u3057\u305f\u3082\u306e\u3067\u3059\uff08\u4e00\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\uff09\uff1a<br \/>\n\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h3>\n<p>Java Singleton\u30d1\u30bf\u30fc\u30f3\u306f\u3001Gang of Four\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3042\u308a\u3001Creational Design Pattern\u306e\u30ab\u30c6\u30b4\u30ea\u30fc\u306b\u5c5e\u3057\u3066\u3044\u307e\u3059\u3002\u5b9a\u7fa9\u304b\u3089\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u3088\u3046\u306b\u601d\u3048\u307e\u3059\u304c\u3001\u5b9f\u88c5\u306b\u306f\u591a\u304f\u306e\u61f8\u5ff5\u304c\u4f34\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u539f\u5247\u306b\u3064\u3044\u3066\u5b66\u3073\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3084\u305d\u306e\u4f7f\u7528\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u63a2\u6c42\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u539f\u5247<\/h2>\n<ul class=\"post-ul\">\n<li>Singleton pattern restricts the instantiation of a class and ensures that only one instance of the class exists in the Java Virtual Machine.<\/li>\n<li>The singleton class must provide a global access point to get the instance of the class.<\/li>\n<li>Singleton pattern is used for logging, drivers objects, caching, and thread pool.<\/li>\n<li>Singleton design pattern is also used in other design patterns like Abstract Factory, Builder, Prototype, Facade, etc.<\/li>\n<li>Singleton design pattern is used in core Java classes also (for example, java.lang.Runtime, java.awt.Desktop).<\/li>\n<\/ul>\n<h2>Java\u306eSingleton\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h2>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u3089\u3059\u3079\u3066\u306b\u306f\u4ee5\u4e0b\u306e\u5171\u901a\u306e\u6982\u5ff5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Private constructor to restrict instantiation of the class from other classes.<\/li>\n<li>Private static variable of the same class that is the only instance of the class.<\/li>\n<li>Public static method that returns the instance of the class, this is the global access point for the outer world to get the instance of the singleton class.<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\u3084\u5b9f\u88c5\u306b\u95a2\u3059\u308b\u30c7\u30b6\u30a4\u30f3\u4e0a\u306e\u7559\u610f\u4e8b\u9805\u3092\u5b66\u3073\u307e\u3059\u3002<\/p>\n<h2>1. \u71b1\u610f\u3092\u6301\u3063\u3066\u521d\u671f\u5316<\/h2>\n<p>\u30a4\u30fc\u30ac\u30fc\u521d\u671f\u5316\u3067\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u30af\u30e9\u30b9\u306e\u8aad\u307f\u8fbc\u307f\u6642\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\u30a4\u30fc\u30ac\u30fc\u521d\u671f\u5316\u306e\u6b20\u70b9\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u4f7f\u7528\u3057\u3066\u3044\u306a\u304f\u3066\u3082\u30e1\u30bd\u30c3\u30c9\u304c\u4f5c\u6210\u3055\u308c\u308b\u3053\u3068\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u9759\u7684\u521d\u671f\u5316\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token comment\">\/\/ private constructor to avoid client applications using the constructor<\/span>\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u304c\u591a\u304f\u306e\u30ea\u30bd\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306b\u306f\u3001\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306f\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u3084\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u306a\u3069\u306e\u30ea\u30bd\u30fc\u30b9\u306e\u305f\u3081\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304cgetInstance\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3055\u306a\u3044\u9650\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u306f\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u307e\u305f\u3001\u3053\u306e\u65b9\u6cd5\u306f\u4f8b\u5916\u51e6\u7406\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3057\u307e\u305b\u3093\u3002<\/p>\n<h2>2. \u9759\u7684\u30d6\u30ed\u30c3\u30af\u306e\u521d\u671f\u5316<\/h2>\n<p>\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306e\u521d\u671f\u5316\u5b9f\u88c5\u306f\u3001\u30a4\u30fc\u30ac\u30fc\u521d\u671f\u5316\u3068\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u4f8b\u5916\u51e6\u7406\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3059\u308b\u9759\u7684\u30d6\u30ed\u30c3\u30af\u5185\u3067\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f5c\u6210\u3055\u308c\u308b\u70b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token comment\">\/\/ static block initialization for exception handling<\/span>\r\n    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Exception occurred in creating singleton instance\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u71b1\u5fc3\u306a\u521d\u671f\u5316\u3068\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306e\u521d\u671f\u5316\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f7f\u7528\u3055\u308c\u308b\u524d\u306b\u4f5c\u6210\u3055\u308c\u308b\u305f\u3081\u3001\u6700\u5584\u306e\u65b9\u6cd5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>3. \u6020\u60f0\u306a\u521d\u671f\u5316 (\u305f\u3044\u3060\u306a \u3057\u3087\u304d\u304b)<\/h2>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u9045\u5ef6\u521d\u671f\u5316\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30af\u30bb\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u4f7f\u7528\u3057\u3066\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u524d\u8ff0\u306e\u5b9f\u88c5\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306f\u3046\u307e\u304f\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u6642\u306bif\u6761\u4ef6\u5185\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u304c\u7834\u58ca\u3055\u308c\u3001\u4e21\u65b9\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u7570\u306a\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u69d8\u3005\u306a\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>4. \u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3<\/h2>\n<p>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u7c21\u5358\u306a\u65b9\u6cd5\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30af\u30bb\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u540c\u671f\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u4e00\u5ea6\u306b1\u3064\u306e\u30b9\u30ec\u30c3\u30c9\u3060\u3051\u304c\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u4e00\u822c\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u524d\u306e\u5b9f\u88c5\u306f\u554f\u984c\u306a\u304f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u304c\u3001synchronized\u30e1\u30bd\u30c3\u30c9\u306b\u95a2\u9023\u3059\u308b\u30b3\u30b9\u30c8\u306e\u305f\u3081\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5225\u3005\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u6700\u521d\u306e\u6570\u500b\u306e\u30b9\u30ec\u30c3\u30c9\u306b\u306e\u307f\u305d\u308c\u304c\u5fc5\u8981\u3067\u3042\u308b\u305f\u3081\u3001\u6bce\u56de\u3053\u306e\u4f59\u5206\u306a\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u30c0\u30d6\u30eb\u30c1\u30a7\u30c3\u30af\u30ed\u30c3\u30ad\u30f3\u30b0\u306e\u539f\u5247\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u306f\u3001if\u6761\u4ef6\u306e\u5185\u90e8\u3067synchronized\u30d6\u30ed\u30c3\u30af\u304c\u4f7f\u7528\u3055\u308c\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c1\u3064\u3060\u3051\u4f5c\u6210\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u8ffd\u52a0\u306e\u30c1\u30a7\u30c3\u30af\u304c\u884c\u308f\u308c\u307e\u3059\u3002\u6b21\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306f\u3001\u30c0\u30d6\u30eb\u30c1\u30a7\u30c3\u30af\u30ed\u30c3\u30ad\u30f3\u30b0\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token function\">getInstanceUsingDoubleLocking<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u5b66\u7fd2\u3092\u7d9a\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>5. \u30d3\u30eb\u30fb\u30d4\u30e5\u30fc\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u5b9f\u88c5<\/h2>\n<p>Java5\u4ee5\u524d\u3001Java\u306e\u30e1\u30e2\u30ea\u30e2\u30c7\u30eb\u306b\u306f\u591a\u304f\u306e\u554f\u984c\u304c\u3042\u308a\u3001\u4ee5\u524d\u306e\u624b\u6cd5\u3067\u306f\u3001\u540c\u6642\u306b\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u3059\u308b\u30b9\u30ec\u30c3\u30c9\u304c\u591a\u3059\u304e\u308b\u30b7\u30ca\u30ea\u30aa\u3067\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u305d\u306e\u305f\u3081\u3001Bill Pugh\u306f\u5185\u90e8\u306e\u9759\u7684\u30d8\u30eb\u30d1\u30fc\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u7570\u306a\u308b\u624b\u6cd5\u3092\u8003\u6848\u3057\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u306fBill Pugh Singleton\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">BillPughSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonHelper<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token constant\">INSTANCE<\/span> <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">BillPughSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">SingletonHelper<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u542b\u3080\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u5185\u90e8\u9759\u7684\u30af\u30e9\u30b9\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3068\u304d\u3001SingletonHelper\u30af\u30e9\u30b9\u306f\u30e1\u30e2\u30ea\u306b\u8aad\u307f\u8fbc\u307e\u308c\u305a\u3001getInstance()\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u305f\u6642\u306b\u306e\u307f\u3001\u3053\u306e\u30af\u30e9\u30b9\u304c\u8aad\u307f\u8fbc\u307e\u308c\u3066\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u540c\u671f\u304c\u4e0d\u8981\u306a\u305f\u3081\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u3067\u6700\u3082\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u3059\u3002<\/p>\n<h2>6. \u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u7834\u58ca\u3059\u308b\u305f\u3081\u306b\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3002<\/h2>\n<p>\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u4ee5\u524d\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u5b9f\u88c5\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u5168\u3066\u7834\u58ca\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span>reflect<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Constructor<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ReflectionSingletonTest<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">EagerInitializedSingleton<\/span> instanceOne <span class=\"token operator\">=<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">EagerInitializedSingleton<\/span> instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token class-name\">Constructor<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> constructors <span class=\"token operator\">=<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getDeclaredConstructors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Constructor<\/span> constructor <span class=\"token operator\">:<\/span> constructors<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token comment\">\/\/ This code will destroy the singleton pattern<\/span>\r\n                constructor<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAccessible<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">)<\/span> constructor<span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>instanceOne<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>instanceTwo<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u524d\u8ff0\u306e\u30c6\u30b9\u30c8\u30af\u30e9\u30b9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4e21\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30cf\u30c3\u30b7\u30e5\u30b3\u30fc\u30c9\u304c\u540c\u3058\u3067\u306f\u306a\u3044\u3053\u3068\u306b\u6c17\u3065\u304f\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u306f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u7834\u58ca\u3057\u307e\u3059\u3002\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u975e\u5e38\u306b\u30d1\u30ef\u30d5\u30eb\u3067\u3042\u308a\u3001Spring\u3084Hibernate\u306a\u3069\u306e\u591a\u304f\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002Java\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>7. \u5217\u6319\u578b\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3<\/h2>\n<p>Reflection\u3092\u4f7f\u3063\u3066\u3053\u306e\u72b6\u6cc1\u3092\u514b\u670d\u3059\u308b\u305f\u3081\u306b\u3001\u30b8\u30e7\u30b7\u30e5\u30a2\u30fb\u30d6\u30ed\u30c3\u30db\u306fJava\u304cJava\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u4efb\u610f\u306eenum\u5024\u304c\u4e00\u5ea6\u3060\u3051\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u306benum\u306e\u4f7f\u7528\u3092\u63d0\u6848\u3057\u3066\u3044\u307e\u3059\u3002Java\u306eEnum\u5024\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3042\u308b\u305f\u3081\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3082\u540c\u69d8\u3067\u3059\u3002\u30c7\u30e1\u30ea\u30c3\u30c8\u3068\u3057\u3066\u306f\u3001enum\u578b\u306f\u67d4\u8edf\u6027\u306b\u3084\u3084\u6b20\u3051\u308b\u3053\u3068\u3067\u3059\uff08\u4f8b\u3048\u3070\u3001\u9045\u5ef6\u521d\u671f\u5316\u306f\u8a31\u53ef\u3055\u308c\u3066\u3044\u307e\u305b\u3093\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">EnumSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">doSomething<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token comment\">\/\/ do something<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h2>8. \u30b7\u30ea\u30a2\u30eb\u5316\u3068\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3<\/h2>\n<p>\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u6642\u306b\u306f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306bSerializable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u305d\u306e\u72b6\u614b\u3092\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306b\u4fdd\u5b58\u3057\u3001\u5f8c\u3067\u518d\u3073\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001Serializable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3082\u5b9f\u88c5\u3057\u305f\u5c0f\u3055\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Serializable<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Serializable<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> serialVersionUID <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">7604766932017737115L<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonHelper<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">SingletonHelper<\/span><span class=\"token punctuation\">.<\/span>instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3055\u308c\u305f\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30af\u30e9\u30b9\u306e\u554f\u984c\u70b9\u306f\u3001\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3059\u308b\u305f\u3073\u306b\u30af\u30e9\u30b9\u306e\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f5c\u6210\u3055\u308c\u308b\u3053\u3068\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileInputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileNotFoundException<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileOutputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectInput<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectInputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectOutput<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectOutputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonSerializedTest<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">FileNotFoundException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ClassNotFoundException<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">SerializedSingleton<\/span> instanceOne <span class=\"token operator\">=<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">ObjectOutput<\/span> out <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileOutputStream<\/span><span class=\"token punctuation\">(<\/span>\r\n                <span class=\"token string\">\"filename.ser\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        out<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeObject<\/span><span class=\"token punctuation\">(<\/span>instanceOne<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        out<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n        <span class=\"token comment\">\/\/ deserialize from file to object<\/span>\r\n        <span class=\"token class-name\">ObjectInput<\/span> in <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileInputStream<\/span><span class=\"token punctuation\">(<\/span>\r\n                <span class=\"token string\">\"filename.ser\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">SerializedSingleton<\/span> instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">)<\/span> in<span class=\"token punctuation\">.<\/span><span class=\"token function\">readObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        in<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"instanceOne hashCode=\"<\/span><span class=\"token operator\">+<\/span>instanceOne<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"instanceTwo hashCode=\"<\/span><span class=\"token operator\">+<\/span>instanceTwo<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u305d\u306e\u30b3\u30fc\u30c9\u306f\u3053\u306e\u51fa\u529b\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>instanceOne hashCode=2011117821 instanceTwo hashCode=109647522<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30d1\u30bf\u30fc\u30f3\u304c\u7834\u58ca\u3055\u308c\u308b\u305f\u3081\u3001\u3053\u306e\u72b6\u6cc1\u3092\u514b\u670d\u3059\u308b\u305f\u3081\u306b\u306f\u3001readResolve\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">readResolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u4e21\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306ehashCode\u304c\u540c\u3058\u3067\u3042\u308b\u3053\u3068\u306b\u6c17\u3065\u304f\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u300cJava\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3068\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002\u300d<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u53d6\u308a\u4e0a\u3052\u3089\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u3055\u3089\u306bJava\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u4e0b\u306f\u3001\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306a\u8a00\u3044\u65b9\u3067\u8868\u73fe\u3057\u305f\u3082\u306e\u3067\u3059\uff08\u4e00\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\uff09\uff1a \u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3 Java Singleton\u30d1\u30bf\u30fc\u30f3\u306f\u3001Gang of Four\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3042\u308a\u3001Creational Design [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-160","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u306e\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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